openssl: fix EVP_PKEY_CTX_get_rsa_pss_saltlen() not returning a value

Backport a patch from upstream. Specifically, this fixes signature
validation in trusted-firmware-a with OpenSSL 3.

Signed-off-by: Ross Burton <ross.burton@arm.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

2 files changed, 109 insertions, 0 deletions

diff --git a/meta/recipes-connectivity/openssl/openssl/0001-Fix-EVP_PKEY_CTX_get_rsa_pss_saltlen-no.patch b/meta/recipes-connectivity/openssl/openssl/0001-Fix-EVP_PKEY_CTX_get_rsa_pss_saltlen-no.patch
new file mode 100644
index 0000000000..b85a3ad7d2
--- /dev/null
+++ b/meta/recipes-connectivity/openssl/openssl/0001-Fix-EVP_PKEY_CTX_get_rsa_pss_saltlen-no.patch
@@ -0,0 +1,108 @@
+Fix EVP_PKEY_CTX_get_rsa_pss_saltlen, and also disable the tests in non-default
+context (required when backporting, not needed with 3.0.1).
+
+Upstream-Status: Backport
+Signed-off-by: Ross Burton <ross.burton@arm.com>
+
+From 6b5c02f6173e5fd46a3685e676fcb5eee9ac43ea Mon Sep 17 00:00:00 2001
+From: Tom Cosgrove <tom.cosgrove@arm.com>
+Date: Thu, 25 Nov 2021 15:49:26 +0000
+Subject: [PATCH] Fix EVP_PKEY_CTX_get_rsa_pss_saltlen() not returning a value
+
+When an integer value was specified, it was not being passed back via
+the orig_p2 weirdness.
+
+Regression test included.
+
+Reviewed-by: Tomas Mraz <tomas@openssl.org>
+Reviewed-by: Paul Dale <pauli@openssl.org>
+(Merged from https://github.com/openssl/openssl/pull/17136)
+---
+ crypto/evp/ctrl_params_translate.c | 12 +++++++-----
+ test/evp_extra_test.c              | 30 ++++++++++++++++++++++++++++++
+ 2 files changed, 37 insertions(+), 5 deletions(-)
+
+diff --git a/crypto/evp/ctrl_params_translate.c b/crypto/evp/ctrl_params_translate.c
+index 88945e13e6..6638209a8d 100644
+--- a/crypto/evp/ctrl_params_translate.c
++++ b/crypto/evp/ctrl_params_translate.c
+@@ -1379,21 +1379,23 @@ static int fix_rsa_pss_saltlen(enum state state,
+     if ((ctx->action_type == SET && state == PRE_PARAMS_TO_CTRL)
+         || (ctx->action_type == GET && state == POST_CTRL_TO_PARAMS)) {
+         size_t i;
++        int val;
+ 
+         for (i = 0; i < OSSL_NELEM(str_value_map); i++) {
+             if (strcmp(ctx->p2, str_value_map[i].ptr) == 0)
+                 break;
+         }
+-        if (i == OSSL_NELEM(str_value_map)) {
+-            ctx->p1 = atoi(ctx->p2);
+-        } else if (state == POST_CTRL_TO_PARAMS) {
++
++        val = i == OSSL_NELEM(str_value_map) ? atoi(ctx->p2)
++                                             : (int)str_value_map[i].id;
++        if (state == POST_CTRL_TO_PARAMS) {
+             /*
+              * EVP_PKEY_CTRL_GET_RSA_PSS_SALTLEN weirdness explained further
+              * up
+              */
+-            *(int *)ctx->orig_p2 = str_value_map[i].id;
++            *(int *)ctx->orig_p2 = val;
+         } else {
+-            ctx->p1 = (int)str_value_map[i].id;
++            ctx->p1 = val;
+         }
+         ctx->p2 = NULL;
+     }
+diff --git a/test/evp_extra_test.c b/test/evp_extra_test.c
+index 83f8902d24..9ad37a2bce 100644
+--- a/test/evp_extra_test.c
++++ b/test/evp_extra_test.c
+@@ -3049,6 +3049,35 @@ static int test_EVP_rsa_pss_with_keygen_bits(void)
+     return ret;
+ }
+ 
++static int test_EVP_rsa_pss_set_saltlen(void)
++{
++    int ret = 0;
++    EVP_PKEY *pkey = NULL;
++    EVP_PKEY_CTX *pkey_ctx = NULL;
++    EVP_MD *sha256 = NULL;
++    EVP_MD_CTX *sha256_ctx = NULL;
++    int saltlen = 9999; /* buggy EVP_PKEY_CTX_get_rsa_pss_saltlen() didn't update this */
++    const int test_value = 32;
++
++    if (nullprov != NULL)
++        return TEST_skip("Test does not support a non-default library context");
++
++    ret = TEST_ptr(pkey = load_example_rsa_key())
++        && TEST_ptr(sha256 = EVP_MD_fetch(testctx, "sha256", NULL))
++        && TEST_ptr(sha256_ctx = EVP_MD_CTX_new())
++        && TEST_true(EVP_DigestSignInit(sha256_ctx, &pkey_ctx, sha256, NULL, pkey))
++        && TEST_true(EVP_PKEY_CTX_set_rsa_padding(pkey_ctx, RSA_PKCS1_PSS_PADDING))
++        && TEST_true(EVP_PKEY_CTX_set_rsa_pss_saltlen(pkey_ctx, test_value))
++        && TEST_true(EVP_PKEY_CTX_get_rsa_pss_saltlen(pkey_ctx, &saltlen))
++        && TEST_int_eq(saltlen, test_value);
++
++    EVP_MD_CTX_free(sha256_ctx);
++    EVP_PKEY_free(pkey);
++    EVP_MD_free(sha256);
++
++    return ret;
++}
++
+ static int success = 1;
+ static void md_names(const char *name, void *vctx)
+ {
+@@ -3966,6 +3995,7 @@ int setup_tests(void)
+     ADD_ALL_TESTS(test_evp_iv_des, 6);
+ #endif
+     ADD_TEST(test_EVP_rsa_pss_with_keygen_bits);
++    ADD_TEST(test_EVP_rsa_pss_set_saltlen);
+ #ifndef OPENSSL_NO_EC
+     ADD_ALL_TESTS(test_ecpub, OSSL_NELEM(ecpub_nids));
+ #endif
+-- 
+2.25.1
+
diff --git a/meta/recipes-connectivity/openssl/openssl_3.0.0.bb b/meta/recipes-connectivity/openssl/openssl_3.0.0.bb
index 8852a51ca8..4b1ae71a85 100644
--- a/meta/recipes-connectivity/openssl/openssl_3.0.0.bb
+++ b/meta/recipes-connectivity/openssl/openssl_3.0.0.bb
@@ -13,6 +13,7 @@ SRC_URI = "http://www.openssl.org/source/openssl-${PV}.tar.gz \
            file://afalg.patch \
            file://0001-Configure-do-not-tweak-mips-cflags.patch \
            file://armv8-32bit.patch \
+           file://0001-Fix-EVP_PKEY_CTX_get_rsa_pss_saltlen-no.patch \
            "
 
 SRC_URI:append:class-nativesdk = " \